Waste Water Engineering
The sewer pipes

All listed here
Are designed for generating self-cleansing velocities at different discharge
Carry sewage as gravity conduits
Should resist the wear and tear caused due to abrasion

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Waste Water Engineering
For treating the sewage of a large city, you will recommend

A sedimentation tank and an activated sludge treatment plant
Sedimentation tanks with high rate trickling filters
A plant consisting of Imhoff tanks with low rate trickling filters
None of these

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